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Cloud [144]
3 years ago
6

Estimate then record 721×8

Mathematics
2 answers:
Hitman42 [59]3 years ago
8 0

721*8= 5768.................
tia_tia [17]3 years ago
5 0
721❌8=5768 so that's the answer
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Hi plz help, if you can ill mark you 5 starz! :)
weqwewe [10]

Answer:

Step-by-step explanation:

Part A= 59.11

Part B: i think is B

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Select one answer choice For part A and select one answer choice for part B
sweet [91]

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3 years ago
Choose the expanded form of this expression 4(1/4 a + b - 6)
zalisa [80]

Answer:

a+4b-24

Step-by-step explanation:

4(1/4a+b−6)

=(4)(1/4a+b+−6)

=(4)(1/4a)+(4)(b)+(4)(−6)

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3 0
3 years ago
Use the distance formula to find the distance if point a is 3,4 and point b is 1,2
Fed [463]

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3 years ago
Convert the Cartesian equation (x 2 + y 2)2 = 4(x 2 - y 2) to a polar equation.
SashulF [63]

<u>ANSWER</u>

{r}^{2}  = 4  \cos2\theta

<u>EXPLANATION</u>

The Cartesian equation is

{( {x}^{2}  +  {y}^{2} )}^{2}  = 4( {x}^{2} -  {y}^{2}  )

We substitute

x = r \cos( \theta)

y = r \sin( \theta)

and

{x}^{2}  +  {y}^{2}  =  {r}^{2}

This implies that

{( {r}^{2} )}^{2}  = 4(( { r \cos\theta)  }^{2} -  {(r \sin\theta) }^{2}  )

Let us evaluate the exponents to get:

{r}^{4}  = 4({  {r}^{2} \cos^{2}\theta } -   {r}^{2}  \sin^{2}\theta)

Factor the RHS to get:

{r}^{4}  = 4{r}^{2} ({   \cos^{2}\theta } -   \sin^{2}\theta)

Divide through by r²

{r}^{2}  = 4 ({   \cos^{2}\theta } -   \sin^{2}\theta)

Apply the double angle identity

\cos^{2}\theta -\sin^{2}\theta=  \cos(2 \theta)

The polar equation then becomes:

{r}^{2}  = 4  \cos2\theta

7 0
3 years ago
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